3.1.24 When is an EMC filter required for a frequency converter?
An EMC filter is required in a frequency converter when electromagnetic interference must be reduced and legal EMC requirements must be met.
An EMC filter is required if:
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Interference with other devices, e.g. PLCs, sensors, IT or measuring systems
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Legal EMC guidelines (e.g. EN 61800-3) must be complied with.
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Long motor cables are used
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The inverter is operated in residential, office or sensitive industrial environments.
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Several frequency converters operating close together
In short:
An EMC filter ensures that high-frequency interference from the frequency converter is not transmitted into the power grid or to other devices.
